Note of Java Servlet session
API A Java Servlet (Servlet) application uses API methods below to access session related functio...
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Download encrypted HTTP live streaming video
m3u8 file Belows is an example of streaming video definition file. Meaning of directive is shown ...
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Use cases of wget
download files from list assumes list.txt contains following voice-record.mp3 agenda.docx minutes...
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Some useful OpenSSL command
OpenSSL is a swiss army knife of cryptography. Help # show option of enc command $ openssl enc he...
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Running network tunnel under TCP is horrible idea
This passage is to explain why running network tunnel under TCP (for example running OpenVPN unde...
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Network limitation of Blink security camera
Network limitation of Blink security camera it supports IPv4 only the MTU of all sections of netw...
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Error on test case annotated with @WithMockUser on application extend Spring Security User class
Symptom application extends org.springframework.security.core.userdetails.User class to store ext...
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Capitalisation of table name generated by Hibernate when using MySQL server
My problem I am working on a Spring Boot project with JPA (Hibernate implementation), and the dat...
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Things done by Spring Boot
Spring Boot is a great tool for helping to build stand-alone, production-grade Spring based Appli...
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How thymeleaf processes value of "th:text" attribute (2)
Introduction Last article is published around 3 years ago, but some of the issue is not discussed...
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A problem tracing experience of application support
Symptom A user reported that in the saved report of a application, all fields related to time are...
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(Bug) value of TIME is altered by MySQL JDBC driver
Description In MySQL specification the type TIME is not affected by time zone setting. But value ...
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Creates Spring Boot application runs in Java Servlet container
On Servlet 3.0 container If you plan to run your project on Servlet 3.0 container (e.g. Apache To...
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Risk of user password recovery in leaked application database
Introduction One of the application design practices is, user passwords should not be stored into...
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About injecting beans managed by Spring Framework into Apache Wicket Component
Assumption Using wicket-spring-boot-starter, which include Spring Boot 2.6.1 and Apache Wicket 9....
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More about Java Serialization
About Serialization interface There is a brief introduction on baeldung to discuss on Serializati...
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Basic operation of NIO Buffer classes
There are 4 internal indicators (capacity, limit, position, remaining) in Buffer classes, example...
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Default Servlet filter loaded by Spring Boot
What is servlet filter You can get the answer from here. How Spring Boot creates and loads filter...
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Passing object as parameter into function
Please read following code. public class Test { public static void main(String[] args) { // Integ...
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== operator for String object in Java
First please read this if you don't sure how to use == operator for object. Example from The Java...
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